1. Department of Neurology, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea.
2. Department of Neurology, Ilsan Paik Hospital, Inje University, Goyang, Korea.
3. Department of Neurology, Yonsei University College of Medicine, Seoul, Korea.
4. Department of Neurology, Catholic University of Korea, College of Medicine, St. Mary's Hospital, Seoul, Korea.
5. Department of Neurology, University of Ulsan College of Medicine, Seoul, Korea.
6. Department of Neurology, Hallym University College of Medicine, Anyang, Korea.
7. Department of Neurology, Stroke Center, Seoul National University Bundang Hospital, Seongnam, Korea.
8. Department of Neurology, Seoul National University College of Medicine, Seoul, Korea.